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    <h1>1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2</h1>
    预格式化标签：pre
    <pre>
       1                 2
    </pre>
    <pre>
           00000000     000000000
        000000000000  000000000000
       0000000000000000000000000000
       0000000000000000000000000000
       0000000000000000000000000000
         000000000000000000000000
           00000000000000000000
             0000000000000000
               000000000000
                 00000000
                   0000 
    </pre>

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